A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 14001, ROCKFORD, IL 61105-4001
PO BOX 14002, ROCKFORD, IL 61105-4002
PO BOX 14003, ROCKFORD, IL 61105-4003
PO BOX 14004, ROCKFORD, IL 61105-4004
PO BOX 14005, ROCKFORD, IL 61105-4005
PO BOX 14006, ROCKFORD, IL 61105-4006
PO BOX 14007, ROCKFORD, IL 61105-4007
PO BOX 14008, ROCKFORD, IL 61105-4008
PO BOX 14009, ROCKFORD, IL 61105-4009
PO BOX 14010, ROCKFORD, IL 61105-4010
PO BOX 14011, ROCKFORD, IL 61105-4011
PO BOX 14012, ROCKFORD, IL 61105-4012
PO BOX 14013, ROCKFORD, IL 61105-4013
PO BOX 14014, ROCKFORD, IL 61105-4014
PO BOX 14015, ROCKFORD, IL 61105-4015
PO BOX 14016, ROCKFORD, IL 61105-4016
PO BOX 14017, ROCKFORD, IL 61105-4017
PO BOX 14018, ROCKFORD, IL 61105-4018
PO BOX 14019, ROCKFORD, IL 61105-4019
PO BOX 14020, ROCKFORD, IL 61105-4020
PO BOX 14021, ROCKFORD, IL 61105-4021
PO BOX 14022, ROCKFORD, IL 61105-4022
PO BOX 14023, ROCKFORD, IL 61105-4023
PO BOX 14024, ROCKFORD, IL 61105-4024
PO BOX 14025, ROCKFORD, IL 61105-4025
PO BOX 14026, ROCKFORD, IL 61105-4026
PO BOX 14027, ROCKFORD, IL 61105-4027
PO BOX 14028, ROCKFORD, IL 61105-4028
PO BOX 14029, ROCKFORD, IL 61105-4029
PO BOX 14030, ROCKFORD, IL 61105-4030
PO BOX 14031, ROCKFORD, IL 61105-4031
PO BOX 14032, ROCKFORD, IL 61105-4032
PO BOX 14033, ROCKFORD, IL 61105-4033
PO BOX 14034, ROCKFORD, IL 61105-4034
PO BOX 14035, ROCKFORD, IL 61105-4035
PO BOX 14036, ROCKFORD, IL 61105-4036
PO BOX 14037, ROCKFORD, IL 61105-4037
PO BOX 14038, ROCKFORD, IL 61105-4038
PO BOX 14039, ROCKFORD, IL 61105-4039
PO BOX 14040, ROCKFORD, IL 61105-4040
PO BOX 14041, ROCKFORD, IL 61105-4041
PO BOX 14042, ROCKFORD, IL 61105-4042
PO BOX 14043, ROCKFORD, IL 61105-4043
PO BOX 14044, ROCKFORD, IL 61105-4044
PO BOX 14045, ROCKFORD, IL 61105-4045
PO BOX 14046, ROCKFORD, IL 61105-4046
PO BOX 14047, ROCKFORD, IL 61105-4047
PO BOX 14048, ROCKFORD, IL 61105-4048
PO BOX 14049, ROCKFORD, IL 61105-4049
PO BOX 14050, ROCKFORD, IL 61105-4050
PO BOX 14051, ROCKFORD, IL 61105-4051
PO BOX 14052, ROCKFORD, IL 61105-4052
PO BOX 14053, ROCKFORD, IL 61105-4053
PO BOX 14054, ROCKFORD, IL 61105-4054
PO BOX 14055, ROCKFORD, IL 61105-4055
PO BOX 14056, ROCKFORD, IL 61105-4056
PO BOX 14057, ROCKFORD, IL 61105-4057
PO BOX 14058, ROCKFORD, IL 61105-4058
PO BOX 14059, ROCKFORD, IL 61105-4059
PO BOX 14060, ROCKFORD, IL 61105-4060
PO BOX 14061, ROCKFORD, IL 61105-4061
PO BOX 14062, ROCKFORD, IL 61105-4062
PO BOX 14063, ROCKFORD, IL 61105-4063
PO BOX 14064, ROCKFORD, IL 61105-4064
PO BOX 14065, ROCKFORD, IL 61105-4065
PO BOX 14066, ROCKFORD, IL 61105-4066
PO BOX 14067, ROCKFORD, IL 61105-4067
PO BOX 14068, ROCKFORD, IL 61105-4068
PO BOX 14069, ROCKFORD, IL 61105-4069
PO BOX 14070, ROCKFORD, IL 61105-4070
PO BOX 14071, ROCKFORD, IL 61105-4071
PO BOX 14072, ROCKFORD, IL 61105-4072
PO BOX 14073, ROCKFORD, IL 61105-4073
PO BOX 14074, ROCKFORD, IL 61105-4074
PO BOX 14075, ROCKFORD, IL 61105-4075
PO BOX 14076, ROCKFORD, IL 61105-4076
PO BOX 14077, ROCKFORD, IL 61105-4077
PO BOX 14078, ROCKFORD, IL 61105-4078
PO BOX 14079, ROCKFORD, IL 61105-4079
PO BOX 14080, ROCKFORD, IL 61105-4080
PO BOX 14081, ROCKFORD, IL 61105-4081
PO BOX 14082, ROCKFORD, IL 61105-4082
PO BOX 14083, ROCKFORD, IL 61105-4083
PO BOX 14084, ROCKFORD, IL 61105-4084
PO BOX 14085, ROCKFORD, IL 61105-4085
PO BOX 14086, ROCKFORD, IL 61105-4086
PO BOX 14087, ROCKFORD, IL 61105-4087
PO BOX 14088, ROCKFORD, IL 61105-4088
PO BOX 14089, ROCKFORD, IL 61105-4089
PO BOX 14090, ROCKFORD, IL 61105-4090
PO BOX 14091, ROCKFORD, IL 61105-4091
PO BOX 14092, ROCKFORD, IL 61105-4092
PO BOX 14093, ROCKFORD, IL 61105-4093
PO BOX 14094, ROCKFORD, IL 61105-4094
PO BOX 14095, ROCKFORD, IL 61105-4095
PO BOX 14096, ROCKFORD, IL 61105-4096
PO BOX 14097, ROCKFORD, IL 61105-4097
PO BOX 14098, ROCKFORD, IL 61105-4098
PO BOX 14099, ROCKFORD, IL 61105-4099
PO BOX 14100, ROCKFORD, IL 61105-4100
PO BOX 14101, ROCKFORD, IL 61105-4101
PO BOX 14102, ROCKFORD, IL 61105-4102
PO BOX 14103, ROCKFORD, IL 61105-4103
PO BOX 14104, ROCKFORD, IL 61105-4104
PO BOX 14105, ROCKFORD, IL 61105-4105
PO BOX 14106, ROCKFORD, IL 61105-4106
PO BOX 14107, ROCKFORD, IL 61105-4107
PO BOX 14108, ROCKFORD, IL 61105-4108
PO BOX 14109, ROCKFORD, IL 61105-4109
PO BOX 14110, ROCKFORD, IL 61105-4110
PO BOX 14111, ROCKFORD, IL 61105-4111
PO BOX 14112, ROCKFORD, IL 61105-4112
PO BOX 14113, ROCKFORD, IL 61105-4113
PO BOX 14114, ROCKFORD, IL 61105-4114
PO BOX 14115, ROCKFORD, IL 61105-4115
PO BOX 14116, ROCKFORD, IL 61105-4116
PO BOX 14117, ROCKFORD, IL 61105-4117
PO BOX 14118, ROCKFORD, IL 61105-4118
PO BOX 14119, ROCKFORD, IL 61105-4119
PO BOX 14120, ROCKFORD, IL 61105-4120
PO BOX 14121, ROCKFORD, IL 61105-4121
PO BOX 14122, ROCKFORD, IL 61105-4122
PO BOX 14123, ROCKFORD, IL 61105-4123
PO BOX 14124, ROCKFORD, IL 61105-4124
PO BOX 14125, ROCKFORD, IL 61105-4125
PO BOX 14126, ROCKFORD, IL 61105-4126
PO BOX 14127, ROCKFORD, IL 61105-4127
PO BOX 14128, ROCKFORD, IL 61105-4128
PO BOX 14129, ROCKFORD, IL 61105-4129
PO BOX 14130, ROCKFORD, IL 61105-4130
PO BOX 14131, ROCKFORD, IL 61105-4131
PO BOX 14132, ROCKFORD, IL 61105-4132
PO BOX 14133, ROCKFORD, IL 61105-4133
PO BOX 14134, ROCKFORD, IL 61105-4134
PO BOX 14135, ROCKFORD, IL 61105-4135
PO BOX 14136, ROCKFORD, IL 61105-4136
PO BOX 14137, ROCKFORD, IL 61105-4137
PO BOX 14138, ROCKFORD, IL 61105-4138
PO BOX 14139, ROCKFORD, IL 61105-4139
PO BOX 14140, ROCKFORD, IL 61105-4140
PO BOX 14141, ROCKFORD, IL 61105-4141
PO BOX 14142, ROCKFORD, IL 61105-4142
PO BOX 14143, ROCKFORD, IL 61105-4143
PO BOX 14144, ROCKFORD, IL 61105-4144
PO BOX 14145, ROCKFORD, IL 61105-4145
PO BOX 14146, ROCKFORD, IL 61105-4146
PO BOX 14147, ROCKFORD, IL 61105-4147
PO BOX 14148, ROCKFORD, IL 61105-4148
PO BOX 14149, ROCKFORD, IL 61105-4149
PO BOX 14150, ROCKFORD, IL 61105-4150
PO BOX 14151, ROCKFORD, IL 61105-4151
PO BOX 14152, ROCKFORD, IL 61105-4152
PO BOX 14153, ROCKFORD, IL 61105-4153
PO BOX 14154, ROCKFORD, IL 61105-4154
PO BOX 14155, ROCKFORD, IL 61105-4155
PO BOX 14156, ROCKFORD, IL 61105-4156
PO BOX 14157, ROCKFORD, IL 61105-4157
PO BOX 14158, ROCKFORD, IL 61105-4158
PO BOX 14159, ROCKFORD, IL 61105-4159
PO BOX 14160, ROCKFORD, IL 61105-4160
PO BOX 14161, ROCKFORD, IL 61105-4161
PO BOX 14162, ROCKFORD, IL 61105-4162
PO BOX 14163, ROCKFORD, IL 61105-4163
PO BOX 14164, ROCKFORD, IL 61105-4164
PO BOX 14165, ROCKFORD, IL 61105-4165
PO BOX 14166, ROCKFORD, IL 61105-4166
PO BOX 14167, ROCKFORD, IL 61105-4167
PO BOX 14168, ROCKFORD, IL 61105-4168
PO BOX 14169, ROCKFORD, IL 61105-4169
PO BOX 14170, ROCKFORD, IL 61105-4170
PO BOX 14171, ROCKFORD, IL 61105-4171
PO BOX 14172, ROCKFORD, IL 61105-4172
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